function hidediv() {
 if (document.getElementById) { // DOM3=IE5, NS6
 document.getElementById('pm').style.visibility='hidden';
 }else{
  if (document.layers) { // Netscape 4
  document.pm.visibility='hidden';
  }else{ // IE 4
  document.all.pm.style.visibility='hidden';
  }
 }
} 

function showdiv() {
var x = (document.body.clientWidth/2) - 90;

 if (x < 296){
 x = 296;
 }

 if (document.getElementById) { // DOM3=IE5, NS6
 document.getElementById('pm').style.left = x + 'px';
 document.getElementById('pm').style.top='103px';
 document.getElementById('pm').style.visibility='visible';
 }else{
  if (document.layers) { // Netscape 4
  document.pm.left=x + 'px';
  document.pm.top='103px';
  document.pm.visibility='visible';
  }else{ // IE 4
  document.all.pm.style.left=x + 'px';
  document.all.pm.style.top='103px';
  document.all.pm.style.visibility='visible';
  }
 }
}